Code source de django.utils.safestring

Functions for working with "safe strings": strings that can be displayed safely
without further escaping in HTML. Marking something as a "safe string" means
that the producer of the string has already turned characters that should not
be interpreted by the HTML engine (e.g. '<') into the appropriate entities.

from functools import wraps

class SafeData:
    def __html__(self):
        Return the html representation of a string for interoperability.

        This allows other template engines to understand Django's SafeData.
        return self

[docs]class SafeString(str, SafeData): """ A str subclass that has been specifically marked as "safe" for HTML output purposes. """ def __add__(self, rhs): """ Concatenating a safe string with another safe bytestring or safe string is safe. Otherwise, the result is no longer safe. """ t = super().__add__(rhs) if isinstance(rhs, SafeData): return SafeString(t) return t def __str__(self): return self
SafeText = SafeString # For backwards compatibility since Django 2.0. def _safety_decorator(safety_marker, func): @wraps(func) def wrapped(*args, **kwargs): return safety_marker(func(*args, **kwargs)) return wrapped
[docs]def mark_safe(s): """ Explicitly mark a string as safe for (HTML) output purposes. The returned object can be used everywhere a string is appropriate. If used on a method as a decorator, mark the returned data as safe. Can be called multiple times on a single string. """ if hasattr(s, '__html__'): return s if callable(s): return _safety_decorator(mark_safe, s) return SafeString(s)
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